Bathtub



FIG. 1 is a top perspective view of the bathtub.

FIG. 2 is a top view of the bathtub.

FIG. 3 is a front side view of the bathtub.

FIG. 4 is a rear side view of the bathtub; and,

FIG. 5 is an end view of both the left side and the right side of the bathtub.

All broken lines illustrate portions of the bathtub to which the design is applied that form no part of the claim. 

CLAIM I claim the ornamental design for a bathtub, as shown. 